Metalworking machine



\ July 20, 1937. H. G. KELLOGG METALWORKING MACHINE Filed May 13, 1935 5Sheets-Sheet lv INVENTOR HOMER G.KELLOGG ATTORNEYS BY f JulyZO, 1937. H.G. KELLOGG 2,087,721

- METALWORKING MACI' IINE Filed May 13, 1935 s Sheets-Sheet 5 F-IG.7.

INVENTOR HOMER G. K BY ELLOGG ATTORNEYS Patented July 20, 1937 T FFIQEMETALWORKING MACHINE Application May 13, 1935, Serial No. 21,289

12 Claims.

This invention relates generally to rolling machines and refers moreparticularly to apparatus for forming strip stock into an arcuatesection of predetermined cross sectional contour.

One of the principal objects of this invention resides in the provisionof apparatus having means for bending a strip of stock to apredetermined arcuate configuration, and having means to preventbuckling of the strip during the bending operation.

Another advantageous feature of this invention resides in the provisionof a rolling machine having means for bending a strip of stock to apredetermined arcuate configuration subsequent to rolling the strip tothe desired cross sectional contour, and having means for exerting alateral pressure upon a portion of the strip during the bendingoperation to prevent buckling of this portion.

An additional object of the present invention consists in the provisionof a rolling machine having a fixture at the delivery end thereofperiodically operable to bend the strip to a predetermined arcuateconfiguration, and having means cooperating with certain of the formingrolls, during the bending operation of the fixture, to exert a lateralpressure upon the portion of the strip therebetween.

A further advantageous feature of the present invention resides in thenovel means provided for actuating the bending fixture and pressureapplying means in timed relation to each other. The aforesaid means, aswell as the above objects and other advantageous features of the presentinvention, will be made more apparent as this description proceeds,especially when considered in connection with the accompanying drawings,wherein:

Figure 1 is a semi-diagrammatic side elevational view of a portion of arolling machine equipped with the present invention;

Figure 2 is a fragmentary perspective view of a portion of the machineshown in Figure 1;

Figure 3 is a sectional view taken substantially on the plane indicatedby the line 33 of Figure 1;

Figures 4, 5, and 6 are respectively cross sectional views takensubstantially on the lines 44, 55 and 6 -5 of Figure 3;

Figure '7 is a detailed perspective View of a part of the lateralpressure applying means;

Figure 8 is a similar view of a cooperating part of the aforesaid means;and

Figure 9 is a cross-sectional view through a molding strip, illustratingone type of construetion capable of being formed by the present machine.

Referring now more in detail to the drawings;

ing rolls H cooperating with each other to form' a strip of flat stockto a predeterminedlcrosssectional contour. For the purpose ofillustration, the rolls 5 I may be considered to posses theconfiguration required to form the strip to the cross-sectional contourillustrated in Figure 9, although it is to be understood that thiscontour may vary materially without departing from the spirit and scopeof this invention.

.In detail, the strip is designated generally in Figure 9, by thereference character l2 and comprises a transversely curved wall isprovided at one edge with a return-bent portion I 4 terminating in aninwardly extending 'flange' I5; The opposite longitudinal edge of thestrip is provided with a flange 56 extending in the same direction fromthe wall l3 as the return-bent portion It and terminating in a flange I!projecting toward the flange 55 previously set forth.

The strip i2 is formed in the rolling machine it with the return-bentportion M extending downwardly from the Wall l3 and provision is made,beyond the delivery end of the machine, in the form of a fixture It forbending the strip upwardly about the periphery of a forming roll itconstituting the top roll of the end set of forming rolls II. As shownparticularly in Figure 2, the forming roll l9 has a portion 20corresponding in transverse contour to the cross sectional contour ofthe top wall 13 of the strip, and is provided with another portion 2|engageable with the periphery of a flange 22 extending radiallyoutwardly from the cooperating forming roll 23. Upon reference to Figure3, it will be noted that the front face 24 of the radial flange 22 formsa continuation of the portion 2!) of the forming roll it and conforms inshape to the contour of the downwardly extending return-bent portion itof the strip.

It will also be observed from Figure 3, that the forming roll 23 issecured to a drive shaft 25, while the cooperating forming roll I9 issecured to a shaft 26 driven from the shaft 25,

through the medium of suitable gearing 2T. The axis of rotation of theforming roll I9 is substantially parallel to the axis of rotation of thecooperating forming roll 23, and both of these axes are arranged in acommon vertical plane.

Upon referring again to Figure 3, it will be noted that the forming roll23 forms the second roll of the end set H and that this roll not onlycooperates with the roll IS in the manner previously stated, but alsocooperates with a third forming roll designated generally by thereference character 28. The forming roll 28 is secured to a shaft 29journaled for rotation about an axis extending perpendicular to the axisof the rolls l9 and 23, but located in a common plane with the latteraxes. In detail, the upper end of the shaft 29 is journaled in a block29 slidably supported in a wear plate 30 for shifting movement in thedirection of the axes of rotation of the aforesaid forming rolls,and-the lower end of the shaft 29 is journaled in a collar 3| mountedfor axial sliding movement upon the drive shaft 25 at the front side ofthe forming roll 23. Thus it will be seen that the forming roll 28 ismounted for rotation at the front side of the forming roll 23 and, inthe present instance, is provided with a peripheral portion 32cooperating with the surface 24 of the roll 23 to receive thereturn-bent portion [4 of the strip therebetween.

Referring again to Figure 3, it will be noted that the forming roll 28is driven from the forming roll 23, notwithstanding the fact that thefomer is shiftable relative to the latter. In detail, the front side ofthe forming roll 23 is fashioned to form, in effect, a-beveled gear 33adapted to mesh with a correspondingly beveled gear 34 formed on theforming roll 28. The cooperating teeth of the two beveled gear portionsare fashioned to provide a limited displacement of the roll 28 relativeto the roll 23 without destroying the driving connection therebetween.

It has previously been stated that as the strip is delivered frombetween the end set of forming rolls H, the same is periodically bentupwardly about the portion Zn-of the roll l9, by means of the fixtureIs. In the present instance, the fixture I8 comprises an arm 35 havingthe end 36 journaled on the drive shaft 25 at the rear side of theforming roll 23 and having a follower 31 at the free end thereofengaging a cam 38. The cam 38 is secured to a shaft 39 driven throughthe medium of reduction gearing 40 from the drive shaft 25, and isprovided with a cam surface 4| of a contour varying in dependence uponthe degree of curvature desired and the number of bends to be formed inthe strip. The actual bending of the strip'is effected by means of aplate 42 secured to the arm 35 intermediate the ends and grooved as at43 to provide clearance for the return-bent portion I 4 of the strip,with the result that the actual bending pressure is exerted upon theflanges I6 and ll of the strip.

With the foregoing arrangement, it will be apparent that the strip isbent upwardly about the portion 20 of the roll l9 upon actuation of thefixture l8 bythe cam 38, and it will also be observed that during thebending operation the return-bent portion'l4 stretches to some extent.This stretching of the return-bent portion l4 of the strip has atendency to deform the same, and in order to prevent deformation,pressure is applied to the return bent portion during the bendingoperation. In general, the above is accomplished by moving the roll 28in a direction toward the cooperating roll 23, during the bendingoperation, to effectively grip the return-bent portion l4 of the stripbetween the surfaces 24 and 32 of the rolls. In detail, the roll 28 ispositively shifted toward the roll 23, by means of an arm 44, having. anintegral collar 45 at one end journaled upon the drive shaft 25 at thefront side of the collar 3i and having a cam face 46 cooperating with acam face 47 on the collar 3| to move the latter toward the roll 23 whenthe free end of the arm 44 is moved upwardly. Inasmuch as the formingroll 28 is mounted on the collar 3!, it necessarily follows that theportion 28 of this roll will be moved toward the surface 24 of the roll23 when the, collar 31 is urged axially of the shaft 25 toward the roll23 by the arm 44.

The required upward displacement of the arm 44 to effect the foregoingresults is accomplished by means of a cam 49 secured to the shaft 39adjacent the cam 38 and having a cam surface 5i] predetermined independence upon the configuration of the cam surface 4!, so as to applythe desired pressure to the return-bent portion M of the strip throughthe forming roll 28, during the operation of the fixture 58 by the cam38 to bend the strip. This arrangement insures maintaining the desiredcontour of the returnbent portion i4 during the bending operation and,in this connection, it may be pointed out that the shape of theremaining portion of the strip is maintained during the bendingoperation, by means of an articulated shoe 5! engageable within thestrip in the manner shown in Figure 4.

Referring now, generally, to the operation of the bending fixture l8 andpressure applying means, it will be noted that as the follower on thefree end of the arm 35 rides upon the cam surface 4| of. the cam. 38,the plate 42 engages the inwardly directed flanges on the strip andbends the latter about the peripheral portion 20 of the forming roll I9to a curvature depending upon the configuration of the cam surface 4!.

At substantially the same time, the free end of the arm 44 is movedupwardly by the cam surface 53 on the cam 49 and this upward movement ofthe free end of the arm 44 causes the collar 45 to rock about the shaft25 in a direction to urge the collar 3i toward the forming roll 23through the medium of the cooperating engaging cam faces 43 and 41.Inasmuch as the forming roll 28 is carried by the collar 3|, itnecessarily follows that the portion 32 of the forming roll 28 is urgedtoward the surface 24 of the forming roll 23 to clamp the return-bentportion of the strip therebetween. It being understood that sufficientplay is provided between the cooperating engaging beveled teeth 33 and34 to provide for the required relative movement of the two aforesaidrolls. It will also be understood that the cam surface is designed tomaintain the pressure on the return-bent portion M of the stripthroughout the entire bending operation.

Thus from the foregoing, it will be observed that I have providedrelatively simple means for bending strips of irregular cross sectionalcontour Without deforming or otherwise interfering with the desiredshape of the strip. It will also be apparent that the means foraccomplishing the above results operates automatically and is notrestricted to any one particular shape of strip.

What I claim as myinvention is: V

1. In a machine for bending a strip of. stock having abody portion andhaving a portion extending at an angle to the body portion, means foradvancing the stock in the direction of its length along a predeterminedpath of travel, a fixture mounted for oscillation about an axisextending transversely. tothe. pathof travel and engageable with thestock to bend the latter, and cooperating means on opposite sides of theangularly extending portion of the stock for gripping the angularlyextending portion of the stock therebetween during the operation of thefixture to bend the stock.

2. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, means foradvancing the stock in the direction of its length along a predeterminedpath of travel, a fixture mounted for oscillation about an axisextending transversely tolthe path of travel and engageable with thestock to bend the latter, means for periodically moving the fixture intoengagement with the stock, and means efiective during the intervals thefixture is moved into engagement with the stock to exert a clampingpressure on opposite sides of the angularly extending portion of thestrip in the region the latter is bent.

3. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, means foradvancing the stock in the direction of its length along a predeterminedpath of travel, a fixture mounted for oscillation about an axisextending transversely to the path of travel and engageable with thestock to bend the latter, cam means for periodically moving the fixtureinto engagement with the strip, and cam means operating during theinterval of operation of the aforesaid cam means to move the fixtureinto engagement with the strip to exert a lateral pressure upon theangularly extending portion of the strip.

4:. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, a revolubleroll having a portion engaging one side of the angularly extendingportion of the strip, a cooperating revoluble roll having a portionengaging the opposite side of. the angularly extending portion, meansengageable with the strip as it passes from between the rolls to bendthe strip to the desired arcuate contour, and means for relativelymoving the rolls toward each other during the bending operation to gripthe angularly extending portion therebetween.

5. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, a drivenroll having a portion engageable with one side of the angularlyextending portion of the strip, a second roll mounted for rotation aboutan axis extending at substantially right angles to the axis of thedriven roll and having a portion engageable with the opposite side ofthe angularly extending portion, means positioned beyond the rolls forengaging the strip to bend the same to the desired arcuate contour, andmeans for relatively moving the rolls toward each other during thebending operation to clamp the angularly extending portion therebetween.

6. In a machine for bending a strip of stock having a body portion andhaving a portion exopposite side of the angularly extending portion,

the strip to bend the same to the desired arcuate contour, and means forrelatively moving the rolls toward each other during the bendingoperation to clamp the angularly extending portion therebetween.

'7. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, a revolubleroll having a portion engaging one side of the angularly extendingportion of the strip, a cooperating revoluble roll having a portionengaging the opposite side of the angularly extending portion, a thirdroll engageable-with the body of the strip, means located beyond therolls and movable into engagement with the strip to bend the latterabout the third roll, and means for relatively moving the first andsecond rolls toward each other during the bending operation to grip theangularly extending portion of the strip therebetween.

8. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, a revolubleroll having a portion engaging one side of the angularly extendingportion of the strip, a cooperating revoluble roll having a portionengaging the opposite side of the angularly extending portion. a thirdrevoluble roll engageable with the body of the strip and with theperiphery of the first roll, a fixture mounted for oscillation about anaxis parallel to the axis of the first roll and engageable with thestrip beyond the rolls to bend the stock about the thirdroll, means forperiodically moving the fixture into engagement with the" strip, andmeans for relatively moving the first and second rolls toward each otherduring the bending operation to grip the angularly extending portion ofthe strip therebetween.

9. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, means foradvancing the stock in the direction of its length along a predeterminedpath of travel including a revoluble roll having a portion engageablewith oneside of the angularly extending portion of the strip, a secondrolldriven by the first roll for rotation in a plane perpendicular tothe plane of rotation of the first roll and having a portion engageablewith the opposite side of the angularly, extending portion, a third rollrotatable about an axis parallel to the aXis of the first roll anddisposed in the plane of the latter axis, said third roll having aportion engageable with the body of the strip, a fixture mounted foroscillation about the axis of the first roll and engageable with thestrip to bend the stock about the third roll, cam means for periodicallyoscillating the fixture, and means for relatively moving the first andsecond rolls toward each other during the bending operation to grip theangularly extending portion of the strip therebetween.

10. In a machine forbending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, means foradvancing thestock along a predetermined path of travel, means forperiodically exerting a lateral pressure upon the angularly extendingportion of the strip of stock as it is advanced along said path oftravel, and means operating during the interval of operation of theaforesaid means to bend the strip of stock toa predetermined arcuatecontour.

11. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, means foradvancing the stock along a predetermined path of travel, meansengageable with the strip of stock as it is advanced along said path oftravel to bend the strip to a predetermined contour, members positionedupon opposite sides of the angularly extending portion of the strip ofstock in the region at which bending of the strip occurs, and means forrelatively moving the members toward each other in timed relation to theoperation of the bending means to grip the angularly extending portiontherebetween.

12. In a machine for bending a strip of stock having a body portion andhaving a portion extending at an angle to the body portion, means foradvancing the stock along a predetermined path of travel, meanspositioned upon opposite sides of the angularly extending portion of thestock and cooperating to exert a clamping pressure against the angularlyextending portion as the stock is advanced along said path of travel,and means operating during the interval of operation of the aforesaidmeans to bend the strip of stock out of said path of travel.

' HOMER G. KELLOGG.

